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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7acd4e16ebf6ca69b8e3112ada5f8b72197f2dec742464808d1c85e0922dae' 
  AND token = '3SvNktxkJ0Bd9MyFJCbWyJ8S8dr298R+M/fDxsyoSmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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