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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd4f66492e519b006432c8c9f1bb8ba3ef5f86eb91deaeca3b196e6f3969e17' 
  AND token = 'GivUiW4cMJe3x2tig6lN5Xe+N3k5u/GQMIKS3paEZ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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