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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323da41a9dd02b4211ee7fefce98e23ab8f1d5f82e3f34816777e3d4af23b335' 
  AND token = 'yRVV28fmPg+9pYpWrV65lXAURU4gj2u+/tcIcrOq6gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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