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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42c6497d659d64c921b1a13ba1e8aa1ab63baa6a3a4a10491712fe92f917223' 
  AND token = '1OLCnwVLIPjznwgOYRAuvOEZ9lu7H1rTNGM8U1gaFPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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