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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ec8ebc754490762ebd0ff8646b34fa495b538ebc1433fe68e46cb485d934c6' 
  AND token = 'BzRvWKA6MpW01lnv0v4bxTIU32bOtD9eQvZO/xoJtME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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