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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3d9d40c70e938fa67d039abba7fd334001b2b44793d215886910af380d772f' 
  AND token = 'uu8rjz4kHuW7UtquCADERrjIR6ZWqaIo1D/cMBNnRZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}