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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4674e13be28c9cc91071d4a461962652950056e015d9b5fb9bbf8b620342c37f' 
  AND token = '7xECGl07ybM3WU+X9Ux3twCI3paZLYqsKiXfOzGO2tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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