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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9abca24db388f6ad4f55028fc383a541ba380b521776288c3c149095edaebc' 
  AND token = '1weee2CEXVIuK1alQ9tHDSnBFFoYgWwXOKoO/CbNTlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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