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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df989c8951ed4098cefe4e3c7d82685ba0a223d12a848168a300f54f9ae98c4e' 
  AND token = 'RtQj9t4JP6Rf38h4Ppqrauf92UoEXcQXgTbYsglMxu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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