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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c338b45eb6e9b9f35c4972c87c6d1538071f6d85712169665d636fd89dcc85de' 
  AND token = '2WHlaBPFcwuXOYkg3D31p8IQ70/ZFiofeEmI3cSOXn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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