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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11720abce8db9a1b0af5fff12fc345241c55555412519988d815aedba8941b7b' 
  AND token = 'QWEqCUDbkq97t2j24xThedb0v9omPaV9/9cJjo0rigw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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