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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e70351b4811c505667fa17160f96967d0c50659eb744501a8bc73a30c12a79b' 
  AND token = 'yoe/C6bGWOYisu8kog6MK+WrODtq0FgVai5cjUBTA40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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