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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a3e96075909203777583c5296bd83249bd93433f4de80e18098a135fddeb12' 
  AND token = 'HDbJBos48NG52yKXuDF/5+D3hpWO+vhHF57TMsQaGhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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