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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d94e7a3bb67b5affcaec63d7cd45e7c77e5876823ad2f26dbf3623dccedb3d4' 
  AND token = '/wXb68vQfW3syZQci6H9/MMVg2NT2GmgLJpsJMy6LVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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