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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1827794b21f7ece8e4fec1398cb5f577f6c7f31ae79ffb8356cca90f54ea0beb' 
  AND token = 'SNe9wcJdddx2Uv/uXrA3ZF3V/KgJeSV29SXPaH9lajk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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