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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ae50a26ae929a766798f529eba80bc37a532707670d512c73e884b6c64d8de' 
  AND token = 'KyoYIVwpBNsBjnBEW0O45Ea7jh2U9kA/RbT+8L0hFtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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