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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4344f58c1604892b37b2e9b68c600da4191d3704d1fd460cb411c0a54f633f65' 
  AND token = 'PMNHsc2tg8rXo4nqdQ152yekiQb8I1zrFG8shWEdL2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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