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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca34bb8c583ffbab3030b29ad2488c5bceac21cda44d525bc6476ffe9f44df6f' 
  AND token = 'Cm8HDs99J9cIlBSTlSaifa0tiNTm38IboXAaMrbVJL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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