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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242f8e8d2dc93858aae4b602af46f2feb669135625084f6cc65386417b441b5c' 
  AND token = 'GE2P6vCLyiZlga3a9SxDF8+OQ54ToLzo1jh5qAa+wV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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