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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124a752c53ac8df8ecbd85b2c7ccbfaf651ea3bf6195ba7ffa423ea5efbb0a60' 
  AND token = 'YJB/PdoaYhOD8awm9N+/ad2o6JN6Omxc5ghAR3/vh68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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