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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3392b16531995b24eacae8b50d2275db99674d98f03951aa3e6e41ab3823d3b' 
  AND token = 'XrTVKMNrpUXpvsY8dFRvpiTD+8aw2qo734LakfiANAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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