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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e5b7daa9afc0f31379eb91820993edd83796ff209c7751b38f86820518b5e4' 
  AND token = 'ybFfLMjSYwvatyeRa3CaNKoGkjFfhxvBjOa4BRnb1b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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