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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22c636519530217692bc673c66e88adb429adaf2bd1514eda3cfff88e520dac' 
  AND token = 'tWQQ85GQ5SZu8StSQnavmY6e6n7L+0OTyvqJacfg1aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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