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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69935a93cdc226ac4ad008e077045e5ab0e1aa8b473a1ceda0f8c546b8b7cee1' 
  AND token = '+GXTmuIrxwpJrWVv4GSZvTWgocDE5AyPwI5rob08PtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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