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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e3b91f36d6ecd456dd31e7116650b855319d5e0cbfece727fc0755d8cf6a87' 
  AND token = '+vy9BEWIqE7zEYUmaHd8oTWd+3AdXEFqw7w7jL6XmO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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