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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f79d96ad80f4b8a1c459f148ebc8ee4fc598de70f66d13a4c293dc4fbf034f' 
  AND token = 'RrRk2/fcaiNx/17K3zC+46bED6TrP234fOqXpfeC0mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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