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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334bf9e270aaf4e14d77983dd516c97ad0ad08856af943b7c929f839dd78833a' 
  AND token = 'K6pnjC/x/TECPosQkjb95ffIdsHXkR4lvCox/InASQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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