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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f939c264fb4ff167c9f404cad5fab7f00d74f11b704aa65bd771bd196166178' 
  AND token = 'rWzQ2/Ofz/3pEOsuoqkP4ka/KzmA7d59eRCs5bOG1Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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