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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58072f757f6050e4f2d3f3f4a519bc2a4f88f3315c5078f351485e5001483468' 
  AND token = 'd5QwjVx5Dd24Noce7XEGN+1IqElm/nouh5+jk4Mq0HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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