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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9235b0c43a3ebb58f27fc32c54e8df419eb867c6098330fae9b62d225e5ccea6' 
  AND token = 'W0f3dqERbH2/6zzximGRbPK/WUMDgPw7KuOi5JHFd0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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