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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf81b920ee1480d8bf18659dca087e91f6eda221dc74f9fe49931442a8e62df' 
  AND token = '83A3KbNTVPvi0iukzTqYKJgb8Ckz1dDW5TL6yNDBwZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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