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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0529ad0048f89eb36a846b92748c2e3878a4da91eb650a09f9d9dfa0df90b1b9' 
  AND token = 'jeQZKyNkG+sXmwe0wdd+pCR1K1reukVgxlC9Y+HYj10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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