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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1139ddfc780919679c04148ed85142e0ce4498f67c6872652bfbd67b2f7b2116' 
  AND token = 'D6lydeTDnATbHvUSZh1mT3omBOewMQS5hT41GzEMT+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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