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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c552ce31b4b9ec9a8793119c8298e3b0bd87c7ff82b9a9a3789df552bb0b932f' 
  AND token = '4lyAFjJ7OwkaZL5J4rn2ils24CcBPzTxFngVyX+RAM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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