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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a413a7b8937dc345e54595fef1dac548d410ca930ed0200727307fb18057d5c3' 
  AND token = 'pM5yQPZkIFAHwuLx292PHbkMo8nk3sJZgUibUBON2As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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