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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff35c69fc95b5461ad2a69ae7957975041effca2c85a79f254d9510fc7080989' 
  AND token = '15O/rrGskKM/IbqanaAaT0h4NVbSQHQ3uQpyV4/S26s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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