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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803186bdecf48d15a7dc0e9c2f99b25b39dd17f0d252e270c9de0f1eeaa86bf1' 
  AND token = 'pAzbhHS5mg3H61Lpy1YpIU/7vFDuCGCT+aMt/TA8k6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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