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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952e92457913b0f5ed11fa2ddd8cc9276e768cb54725dec24bd2e41416a55fd1' 
  AND token = 'OlxcNUEdLAwIIqdreub642s7k9O/cN/PHlGatfGq3lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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