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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e40adcbb3861ae3f43d12c3a2d8cd2230ffbce1e66fbe8b6c9377ebc62e4118' 
  AND token = 'QCbbBL20J/TyN1oX9Kqm4JPFHh8dMUzBEQJLvyAldac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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