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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4472d600f27b24bd8e205a25e6e0bfac18fe311d989140e6e1f0d5c88787e7' 
  AND token = 'kG0AmeXB7ZJrDs4mP0CeaVOoUwxUSo5P5DZnRKyohNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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