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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33b2d344c0c86c30cb5b45e57eac9a3b75e5eca52f9cdde2c70ef912a6a3962' 
  AND token = 'RFvH1xOiTVWS7gQ9LXuVD0TxzCTYUBN2ZYVrgpBzI3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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