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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9c13a0a03f22ead294ed504c91c385d92dd9258038a2904652b76d8904be2d' 
  AND token = 'Ppd0V0OehFmSIbftApToyC5u3s8EOFyHlwx2FwRH5BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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