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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ff4f8ae9d2ccdf3a70cb8d72ed303eca772f2bd318898ccc69c480bfe5cb4c' 
  AND token = 'RiVbbm5+dJY6owvteAiFfoCAJ962XxWVf1LrSy6WFXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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