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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9703e154e3ef9aaee6aaa71af7e7e47d399dfdc2437aceb41321a76286120c3' 
  AND token = 'dqROfscRTiAQkH0lvO9rjvG6CYYuhAt/iDudAPTVv1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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