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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ed1b7bc8dce4f2009ce6c7d69b0dc128efeab46c2e1f478d846c5525637d54' 
  AND token = '5WLNgk7NLQLO545xslV/XWw71s/RYZb1fitr48GsSrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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