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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffd8668c8841de55bf9d6e127621dc77aa1f11b00f401e0a6c80d82f8253f24' 
  AND token = 'D9yoU43ABI0bpRgJ7eFDeK6O502IxmRXF1sKWhvK6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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