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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0db356b3de93436a94258fa62bb3ed4a7770d01c6019e381ccd869423de361' 
  AND token = 'ta/nu5ZA9wbZZKH1UzJ8DubQjnfp7TYj5YKwrxAi2Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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