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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5308290be51f2cd695779393a96e45aa257ae4d96cacf7629e18657492a7675d' 
  AND token = 'haE7fbFhNVRdfXr00c7+izQGbKq8YIeZ6AgHnE5UUd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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