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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9677690dea290af64a0e2107886e9b7eadd1c0e35a2a5a3ede474039047106f0' 
  AND token = '7iY1uNTgTmt5yY7OYAbMyxuoHoOVu4pq7LwD/xwgHAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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