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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46dd2e15901561a3c1e99a97f07c6327ece436b902e625ce30e4a2fec4ca362b' 
  AND token = 'BIfbHB3lzIw61MuMGKHJ7eel4ftTU7EKNyCj6KSucoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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