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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4814fe9a6ca06f3c90d5a090aa3893e740c50b34b4ff567c6a7466ebe6924a' 
  AND token = '6LuQ6Ko8l/edSUIjETL1m4sq5InE26m2p+LGQkv9e7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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