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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4325e9da7e6677890ed3afc908992ac6f4e98ac58ca612cbd63493e08efd08' 
  AND token = 'MVaSSl0iV4lvCjvMsHDciQBpOldELObhd3t88kcmzQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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