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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ff75858b841f2e163a9c2ed4265a543da9cb287d71d3c56a5bf687d121718e' 
  AND token = 'FLA5N7w6v8J2FtQ6Esqv4Z4gcPJOyFu4vrsfLGHFwms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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