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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c163e5c1d58076f4f2a942cd619033851ba0b77deb4d0e6e86c5044d69c3e94' 
  AND token = 'Y/IIoMRNtvoo9G5Ej3mpQ62w9MsJTdM+awhB8zTXZD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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