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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb6434bccc53bd8db4f292185fdb300aaa404bd154496ba1172c1f692b311a4' 
  AND token = '8lc9nqeKy3IdkxMc8m6gIUwI9UJmNSyzcJZBR8ykqgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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