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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dcaec0aa6815469aa5cbbf9c8ab64f38bc446b567d7016283484bb2a9337d6' 
  AND token = 'plZNa0OJk35qGmOfxPSHU+ghur/re9uWNxnyLEIVXe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00205

JSON explain

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