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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38edb3a0e3f5c5013726d12bf01c0b060673f851a319064d54328414cdaf076d' 
  AND token = 'ilBLg4qC5QTHALcuDw5tGa1KQ/weOOFbe79b9lvhEHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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