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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1656a2d8d8693202034b3bdbbd249fb9638521beedf3149a1d0d1290815e7886' 
  AND token = '5TxiNl3+YMaKRueaxoR7tRrcDm4N6fMxdKdQInf8O98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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