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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2b7dc2168f00291805993b8a081cf4f39301be2548679c63711814b945b928' 
  AND token = 'fh+XZWAluEWbkUCJrR2VlnTzgN/6inqEFMTOU87Dyzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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