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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698cebaa920975f5b3eee36f3dc474f49db22890f0d7be0a3c81fd9a11238bf2' 
  AND token = 'QGPyj3p38D4RNYdc8sRcB3TXenl3MpR7ucchGBYuqPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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