SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf297172b9c19a76b1174274c643c92ba82f8a0ee1d3d0255555de75885d86a' 
  AND token = 'i1KlYng4V4xUZC9qLOcbrxpRh4Jv5scnqK6jP/ptygs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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