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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7663cca4a61c988fe3ee44237b77b48af68d042e0ce100f23fcae20eeeb82b0d' 
  AND token = '1aIWHXLUbKfd5F6K9w8qJ4v6OcAKD8h4hpR+DZedHNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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