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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bd589bd72f4f67c8aa4633d81968bf806197a0db8cd3a9e7c54a18d0373a2e' 
  AND token = '1fwj7da3MmPiGP7V+nZlyv7XQG7AbTqdL00HQ4Wqm74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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