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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1ddb8429843b199f8eefceaea2252eb55aca4c93143955a9b1abb4747a9896' 
  AND token = 'SHKOPjhXfE0WStGxKKF4Hca8wfrQxOc1OoRryWafLJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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