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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d66b93d5103d89f72e52963faa9924127a44309144c2fac0316a23b5f190619' 
  AND token = 'zBtbulhvlW186ZMThXRSIvBemUy69QFifzAlZkTw45Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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