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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0cb06ffa7e91ffa4b6dde49737323f9933ab47a4c2ccf810659b9396cb9d45' 
  AND token = 'kUg+in/hbCJseXgXeX5ULHPjAnHg0j/0P3vbxy9Ushw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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