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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450c41ed0b4ad3b5df4a09bc22fcecb6c6a885acf8a8b8f46ae79d071c419cf3' 
  AND token = '1qU2SWxlOqI9OjxXpGFs9W1e+CCv2ae6372ts/RdFIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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