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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33078140b8642d412d8ddc5c9925ab5a6656665a599a89a764e5c4823daf688b' 
  AND token = 'Cu7Z1xpA3fQuK1sKJIGNXvBaNRw4cSmp3A51/FemhEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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