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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f9a9a218f26a5a42dd005280e559ff24a6a5ea7a067c02bb1eaaf5ec8c923d' 
  AND token = '9E57UZGXh1HgnYu/IX/Qqb71Zq/nZ39BZ2ADe1weQNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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