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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c23136ec6e1083f2aa0912c72e8cb4ffedf2319f60e00941e97fa00b60f0be' 
  AND token = 'p4xkm1tu721Ku8vWIyU5I2omNKMKzQ0bJ0vrN4lkvv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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