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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ef51393768ee1e83a58ecb7afc064aafb80e617e87a4d20c8755ff0e1ad2e6' 
  AND token = 'Mz2q+7YCq/ohC3gkTJ4f+dB3SmdtDUJk8yvsFBVDX4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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